Highest temperature in Shanghai on July 13?

Platform comparison

Market context

Shanghai is currently experiencing a cool, rainy start to 13 July, with a maximum temperature forecast of just 32°C at 14:00, significantly below the seasonal peak required to trigger a YES outcome in this market[4]. Overnight lows have hovered around 28°C amid broken clouds and light showers, creating a damp atmosphere that suppresses the intense heat typically seen in mid-July[4]. The 0% crowd-implied probability reflects this immediate reality: the day’s thermal ceiling is already constrained by precipitation and cloud cover, making a record-breaking high unlikely before the settlement window closes at 12:00 UTC tomorrow.

Historically, July in Shanghai sees daily highs averaging 30–31°C, with frequent spikes above 35°C and extremes reaching 40°C in past years[3][6]. However, the current 2026 pattern shows a marked deviation, with forecasts for the month ranging only 29–33°C and no indication of the dry, stagnant air masses that drive extreme heat[1][9]. Comparable cases from recent years show that when rainfall and cloud cover persist through midday, maximum temperatures rarely exceed 34°C, reinforcing why the market has priced in near-zero chance of a higher range.

Traders should monitor the 14:00 local temperature reading at ZSPD, as this is the projected peak for the day[4]. Any sudden shift to clear skies or a drop in humidity before 15:00 could marginally raise the ceiling, but the prevailing shower activity and fresh SE winds at 24.6 mph will likely keep temperatures capped[2]. No major weather announcements are scheduled, but the National Weather Service’s 72-hour timeseries for ZSPD offers the most reliable real-time dependency for confirming whether the day remains thermally subdued[8].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Today trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.